I consider "lots of mildly upvoted quotes" to be a failure mode of this thread. It becomes a place where one can too easily come and spend a lot of time reading things of little value. Alternatively, it becomes a place where one doesn't bother to come, because the good stuff is drowned out by the mediocre stuff. Rate-limiting posters seems like a pretty good way to avoid this failure mode.

I don't believe you're evil for rule-lawyering and depriving people of good quotes.

One can debate the norms of a thread, or one can look at the listed expectations of the rationality quote thread:

No more than 5 quotes per person per monthly thread, please

Have you done more? I haven't counted and don't care. I don't think rationality quotes threads have any value beyond karma mining anyway. I object to accusations of "rules-lawyering" on the grounds that it is an almost always an attempt to pretty up "I disagree."

I believe there are stressors in your life that pressure you into acting that way, unaware of the social consequences in their enumeration.

Telling someone else what their motivations are is trying to pick a fight. Stop.