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.
“Spare me through your mercy, do not punish me through your justice.”
“In the years since I worked with John Hughes, there were many years where I literally had hundred of doors slammed in my face because I wasn't that kid anymore, and I wasn't a character actor, and I wasn't a leading man, and I wasn't whatever Hollywood was looking for.”