It's unprofessional. She can speak to house management, etc. to have matters addressed.
Yes, it is rude and unacceptable when audience members do that, but matching that behavior is lame IMO. I think people who believe her antics are fine would start feeling differently if all actors began the practice and interrupted shows to correct audience members. Actors are trained to transcend distractions.
Wasn't she fined for her Gypsy meltdown? If so, it was done for a reason.
I agree that audiences are getting worse by the day, but as a performer commit to the performance or don't perform. She could have easily left the stage and had the matter addressed by someone else. She looks like a moron when she does that.
"The sexual energy between the mother and son really concerns me!"-random woman behind me at Next to Normal
"I want to meet him after and bang him!"-random woman who exposed her breasts at Rock of Ages, referring to James Carpinello