I live in a 50 unit suburban condominium complex, with a mix of owners and renters. I own my condo. Each unit has 1 assigned parking spot, which is under a metal carport-type roof and marked with the unit number. We also have a ton of open parking throughout the complex, none of which is covered. I've lived here 6 months and there are always lots of open parking spots.

I am disabled and don't drive, so my assigned spot doesn't ever have a car parked in it. I rarely have people visit me, so I truly don't need my parking space for any practical reason.

Sometimes people will pull into my spot briefly, waiting for a friend etc., and I don't mind that. Sometimes people park in my spot for an hour or so, which I find mildly irritating, but understandable, especially if it's raining or really hot weather. But there's a car in my spot right now that's been there overnight, and it's now afternoon. The weather is cold (30°F lows) but clear and dry.

I'm irritated by this car being in my spot, not because I need the spot, but because I think it's rude for someone to park there for 12+ hours without asking me if it's okay. 

I'm not planning to do anything about it right now, because I realize I'm irritated about something that has zero actual impact on me, but I want to know if I'm TA for not wanting anyone to park there even though I'm not using the space.