IME, one of the more prominent issues is the tedium of single-issue vegans who don't really talk about anything but their veganism, vegan principles, veganity, and associated vegan-oriented topics of conversation.For those that didn't know this, vegans come in all shapes and sizes, just like people in other groups, which kinda makes the OP question a bit silly.
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Even if there do happen to be a few "bad apples" amongst vegans, I think the underlying principles of veganism are fairly sound, and the carnist counter arguments are for the most part a bit of a joke.
Someone more droller than I might also reflect that, in fairness, well* over 11% of your 9 posts are not about veganism.
*let well = 0.11111111111%