Generally yes. The people I've hung out with while they were doing coke were pushy, mildly aggressive, and would just. not. shut. the. fuck. up. Being sober around cokeheads is not a pleasant experience.

That said, I did coke once(well, twice, but I'm pretty sure the second time was foot powder). It was absolutely serene. I felt crystal clear, dialed in, and perfectly zen. I didn't have a desire to talk, but to just observe. I felt like I had the hearing of a cat. Then again, I probably have unmedicated ADHD. No commercial stimulants have ever made me feel like that though.