Most of the time, this wouldn't bother me at all. A quick conversation and I put it behind me. I did however have a boyfriend who, unbeknownst to me, had many friends who were parents at the school. We went to a Christmas "Do" where silly, drunken, party games were played and with all the parents there, I didn't feel able to join in. He got really cross about me being a party pooper when I wouldn't get drunk with him. He just didn't understand the word, "professionalism." That was the end of that relationship!
More recently, we went to Rome and a young lady with a school party kept looking at my husband who was jokingly terribly flattered at the attention. It was only when the teacher went to pay for the meal, we noticed the name on the bag was the one of my son's school. The young lady in question was an ex girlfriend who was trying to ascertain whether it was us. I had one deflated husband!