Users: right now, 4. I can tolerate quite a lot, but some people just want to argue and are frankly insufferable about it. I don't even mean people arguing with me personally. I do reevaluate from time to time and occasionally take people off ignore. I actually take people who I've ignored and later been perma banned off ignore since I'll never have to see their comments again anyway, but it does delight me to see I was a correct judge of character on those accounts.
Threads: 9. I didn't even realize I was ignoring even that many until I checked. It's a combination of one thread that was too gross for me to want to think about, some threads that were made in incredibly bad faith, and a couple on subjects that simply depress me enough I don't want to think about.