Accepting that one is queer often includes a significant deal of shedding at least some of the internalized constraining expectations of society in order to accept yourself, so queer folk have a 'cleaner' slate to resocialize themselves on, if you will.

As a general rule, obviously none of this is universal, and there are plenty of poorly socialized toxic queer folk out there. But I'm inclined to agree that they're less likely to be toxic, in my experience as well.