This is your opinion, and a bit insulting considering you have taken a broad brush stroke across a country of 300+ million people, including myself. Perhaps you should get off the twitter bubble and go get involved in your community.

A few issues with your argument:

1) "plenty of old men" is almost certainty referring to the common portrayal of "old white men" and more broadly speaking all White Americans.

Let's just pick this one apart. I cannot speak for all the various religions in the US and their relative charity work, but I know that every church I have ever been apart of has done a tremendous amount of charity work not just in their local community but across the globe, mainly in third world countries - of not "white people". I will make the responsible assumption that other religions do the same. Considering more than 40% of US citizens attend some religious congregation weekly, that means more than 150 million Americans are contributing physically, and likely economically, to global organizations that have shared culture and do "goodwill" in the US and abroad... most often for the "suffering", and a large % of this group of Americans are white, many of which are old - as it's well known that religious observation is significantly greater among pre-Millennial generations.

2) Speaking to the remaining 60% of the United States, more than 62 million Americans volunteer, it's growing every year, and more than half of American's contribute to charity. Again, even assuming 50% overlap with the active-observant religion 40% of the population, we can assume almost every American contributes to an organization either through labor or charity to help those who suffer, and the delta of those who are likely not contributing physically or economically are probably those receiving said charity, and not a huge swath of millions of racist anti-American "countrymen".

3) To your point about a "disconnected society of mostly old white men", I have lived in South Florida for most of my life, where there is a HUGE influx of immigrants and refugees such as Cubans, Haitians, Central Americans, and most recently South Americans, i.e. Venezuelans - where these communities often represent double digit % of the population, and majority of the population in certain large geographic areas. You cannot "drive around" without seeing a car displaying a flag of their country of origin. From the tone of your comment it sounds like YOU have a problem with that behavior? You are essentially calling them un-American.

Frankly speaking as someone who has gone to public school with the children of these people, most of which the children were born outside the US, many of which are "Dreamers" - I know many might "long for their homeland". I know many have immense pride of their heritage. But these people that I know most often have joined the military, police, or other government service - because that is more often then not a stable, often guaranteed, step up in society both economically and I believe from a respect perspective which by your argument they apparently still have to earn. I assume you do respect those vital national and local services, regardless of the "Americanism" of those carrying out the services.

4) American Culture is defined by "shared culture", it is unique compared to every other country in the world BECAUSE OF THAT, not in spite of that. It is constantly changing and evolving. And the fringe that you speak to is simply ignorant of that fluidity that makes this country so unique and grand. I won't make the assumption of generalizing you and putting you into that fringe, but you certainly are amplifying that group by accusing all others of being apart of it without any evidence or scientific fact.