What data is out there says it's rare. Is the data really that much better for the vaccinated getting infected? I seriously doubt it, but you hear that message everyday, every hour, that the vaccinated are getting infected.

Fully vaccinated people are still getting infected with Covid. Experts explain why
So-called "breakthrough" Covid cases are being seen in people who have had two doses of a coronavirus vaccine.
It’s difficult to know the full extent of “breakthrough” Covid cases because cases in vaccinated people tend to be mild or asymptomatic and could go easily go unnoticed, but figures collected by NBC News has found that at least 125,000 fully vaccinated Americans have tested positive for Covid and 1,400 of those have died. Still, the 125,682 “breakthrough” cases in 38 states found by NBC News represented less than 0.08% of the 164.2 million-plus people (and counting) who have been fully vaccinated since the start of the year, or about one in every 1,300.