Pintsize is abrasive by choice, knowing exactly what he does. But as other people mentioned, he's not malicious by intent.
Although he's usually quite obnoxious, he has his clear moments where he flat out helps out without being crude.
Bubbles, if she wanted to, could turn Pintsize into dust both literally and metaphorically (the latter she's just shown recently).
Personally, I believe this asserts a certain level of baseline between the two of them. As I believe Bubbles sees right through Pintsize and all his antics, there'll be a moment where she'll use Pintsize as kind of a "Tactical Nuke" to prank someone, and it's going to be glorious.