As they say, there are two rules in improv: Never say no, and never ask why. When another actor asks 'Why?' or says no to something you're suggesting, then it's very clear that they're putting the onus on you, because they're not comfortable with it themselves.
“I'm crass, contemptuous and crude, obstreperous, obnoxious, rambunctiously raw and rude.”
“I don't want to be the center of attention. My posture has changed. I walk with my head down and shoulders slumped. Suddenly I carry myself as if I'm ashamed of something.”