There are instances of some gay panic moments, especially in the earliest seasons when that was the norm for early 2000s western culture, but to suggest "a lot" of the humour is of this nature is just plain false.

The problem is when you take something out of its time and see every portrayed character as stereotype - you will kill all humor in the end. Imaginge some todays series in 10 years. There will always be some further developed people who adapted their own human being to whats morally acceptable in given time.

Ask people who are "affected" by the humor and if they are offended. Or make jokes about growing grass.