You're on a rare path with Wrex dead, there will be...opportunities far into the future that are made available to you if you make the right...or wrong choices. The path less travelled can be more interesting. Tali got pissed off because she said she'd share Veetor's omnitool data with you, you basically didn't trust that she'd keep her word by taking Veetor. Then to rub in the fact it was a dick move The Illusive Man said they got nothing useful out of Veetor. The sequence of dialogue is supposed to make anyone who picks it feel kinda bad, unless you are playing as everyone-can-go-F-themselves-I'll-do-what-I-want Shepard.
