Who said they’re right?
They’re not right.
Perhaps they are ignorant of the halacha, and are not knowingly sinful. You should educate them.
If not keeping a mitzvah out of ignorance is enough to keep one in the “frum” community, then there are a lot more “frum” Jews than you think. Heck, a fair portion of the unaffiliated Jews worldwide could be considered “frum.”
The Wolf