Steven just looks at Strange, completely failing to comprehend the implied diss. He would never really consider crying to be 'acting poorly', so he's got zero clue what's being referred to. He tilts his head a little, frowning.

"Just because other people are doing it doesn't make it okay..." he says, trying to understand. "I don't mean... making mistakes and stuff. Just... You're really nice to me most of the time, but then you get so mean..."

Which he is sort of familiar with, from other people he's known. He just knew those people a bit better than Strange.