I am in a call with my friends and I don't want to talk on the phone with my girlfriend, so I'm ignoring her calls.
Isn't that kind of rude to just ignore the phone calls of your girlfriend?
I know, but I am punishing my girlfriend by ignoring her calls.
I get where you're coming from. It's not good to ignore your girlfriend's calls, though.
I just want to show her that she's annoying, I don't care about her hurt feelings.
If you think that she is annoying, you should let her know what is annoying you about her. Simply ignoring her and not telling her anything is not something that is going to help your guys relationship whatsoever.