I had an ESTp brother-in-law... at one time.
When I was in buddy-buddy mode and he was in sane-person mode we were fine, but I found a little bit of him went a long way. The biggest conflict for us was the fact that he had a Fi-polr, and I have a very selective Fi. Plus, he had major mommy issues and was very insecure about what people thought of him. Not an explosive mix, but it meant that my normal flow didn't really allow for his issues, and he always interpreted it as me not 'respecting' him when respect had absolutely nothing to do with it..