I've dealt with alot of airports and can't say that I truly hate any but here goes:
PHL - I would have to agree that PHL can be quite a pain in the butt if there's anything other than sunny skies.
BTL - Battle Creek, MI - just because WMU's flight school is based there and if the weather is nice there are tons of student pilots in the air and the ATC can be down right mean.
AZO - Kalamazoo, MI - I actually love this airport. I just used to hate it when I worked for an airline there. Something about having to be at the airport at 5am in the middle of a snow storm, deal with 32 angry passengers who can't get to their destinations, have the snow finally give way, load all their 90 lb bags into the plane, board the aircraft, marshall it out, then go sit in the de-ice bucket and get sprayed with gallons of glycol backwash. Then to do that for the rest of the flights all day. Oh well, those days are done (and quite honestly they weren't that bad because I was working at an airport and not much can beat that)
STL - yeah that airport has a weird design. I can remember being on SW one time watching the line of aircraft coming in to land and having our jet taxi across the active. Kind of scary, just hoping the pilots saw all the needed traffic. I saw at least one plane go around due to improper spacing.
I guess that's about it.
Happy Flying!