Is this the right way to use the word "pretentious"

[Ourlawcowboy67]

I thought you had people that wanted it and I just thought we'd spend a little time together but seeing as how you're being a pretentious ass

 

[Tdol]

It could be and sounds fine, but it's hard to say without knowing how they had behaved. You might want to put some punctuation in- it reads as a stream of consciousness.