I don't think you're being too sensitive. I get pretty pissed when I get asked about my gear especially when I know the Armory is working. If someone cares that much, they can take the 20 secs it takes to alt + tab out and look it up. Like someone else has said, flip the questioning on them.
I've had this scenario happen for a god damned heroic UB group:
Group Leader: How's your gear?
Me: I've tanked this place more times than I can count. If you want to know my gear just look at the armory
5 seconds later
GL: Ooohh cool you can come
*You get invited to group*
GL: You coming?
Me: No I'm looking up your gear
GL: No it's cool you have plenty of health and your gear is great
Me: No I'm not coming... I can't believe someone wearing a level 62 blue item and a quest item green is asking people about their gear. You should just be happy to find any tank. Go find someone else
GL: Really sorry, we've just had bad luck with groups *yadda yadda bullshit*
You've got to start being stiff with these people. DPS is everywhere, tanks and heals aren't. Remember they need us, not the other way around.
Maybe I just have a hard time tolerating laziness when they could seriously not whisper people and just look them up. It wastes my time to answer everyone interested and I refuse to be rejected by some scrubs when I know I can tank any heroic.
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