Isn't the point of a democracy to allow the people to have a voice? It is starting to seem like many progressive groups are trying to vilify an individual's freedom of speech/thought.

Of course, but the norms in society do shift, things that were once seen as deviant standards from the norm, may become accepted for a wide range of reasoning, society and what it expects of its members continually evolves, and has for millennia. I disagree that this is trying to vilify any thought, society has largely shifted, especially in coastal regions on this topic. It is accepted among many in metropolitan, young, urban areas that gay marriage and the rights of gays to couple and be recognized is a civil rights issue. Calling out someone who opposes that, are for many people the same as calling out someone who would presume that interracial marriage is wrong, or that segregation should still exist.

I believe everything starts to collapse when I try to use my beliefs to rally against another individual.
Do you really believe that? The nature of the marketplace of ideas, and how society shifts, is essentially exactly this. Beliefs are pursued through elections, advocacy, legal systems, exposure to people. 50 years ago it was unthinkable that gay’s would be accepted and have a protected right in some states to marry, 100 years ago it was unthinkable that blacks and whites would attend the same school together and just about 150 years ago, a war was fought to end slavery. These all come about because beliefs are rallied against other individuals in position of influence and power and a side wins.

I have the belief that our founding fathers knew America would be a melting pot of religions, cultures, and beliefs and that is why they established state's rights to accommodate the beautiful array of citizens of which would make the United States of America.
I’ve studied this period in American history a great deal, and I don’t think I’m making a leap to suggest that I do not believe this to be the case at all. The founding fathers in reviewing many of their writings, federalist papers and more, do not seem to anticipate anything but a society rooted in the landed aristocracy they knew and were a part of. The application of the rights in the Bill of Rights was slowly but surely expanded to all people and then slowly but surely enshrined to the states. Consider the text of the 14th amendment, to come after the Civil War and finally settle the issue of who a citizen is, the 15th protecting the right to vote for blacks, the 19th to only come after World War I giving women the right to vote, and the 26th passed in 1971 allowing 18 year olds to vote.

If we’re going to credit the founding fathers with anything its a system that places branches of government at odds with each-other, and that does tend to evolve with society, and not be locked into a set of rules understood as necessary in 1789, although there are plenty who would disagree as well.

If we continue to push one set of beliefs how different are we than North Korea, Iran, etc? Because we aren’t jailing people, we aren’t executing people, we aren’t using the power of law to say you may not speak about an issue. But society and people can decide not to support a position any longer.

This slippery slope has existed always and predates America, imo.

Edit: sorry for any grammatical, formatting errors wrote this from mobile and quickly.