TASK DEFINITION: We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.
PROBLEM: I am routinely amused by people of prejudice, who obviously know little about gays, trying to tell gay people what gays are like...

SOLUTION: Valid

PROBLEM: And it is really sad that people like him complain about being called things like "bigot" and claim that there is no evidence for such things, and then go and say disgusting things like what you just quoted.

SOLUTION: Invalid

PROBLEM: If mental illness is a myth, the critics argue, so is physical illness[citation needed], because both categories have fuzzy boundaries and are to a large extent culturally determined.

SOLUTION:
Invalid