There is a rule for malicious intent, but in my ~8 years of paintball, I've only ever seen penalties thrown for it maybe 6 times.
What you'll find is this is almost always up to the ref's discretion. I've been in the situation you described, and I did the exact same thing. The player will often get upset, and sometimes his reaction will sway the ref, but a good ref usually understands the situation.
Take a warning for what it is. If a ref gives you a warning, or throws a penalty, then you know where the line is. Until then, I'd say play how you need to play to win if you're in a tournament setting.
If this occurred in a recball/walk-on scenario, though, I'd say just take it easy unless you're playing with people that you know can take it.
Growing up at different fields here in NC, back when I was playing in jeans and shooting walmart guns, those were the days of 15bps ramping, and I got bonus balled a lot. It still happens to me all the time. Instead of getting upset and crying for a penalty, I just make sure to get off the field as fast as possible and take a note of who it was and give it back to them when I get a chance.