It's laziness plain and simple. no excuse. The lounges have ample facilities for this. Can't remember from the OP whether this was at LHR or not, but in the 12 flights we've taken with our 19m old pocket rocket, we've never had a situation where changing him in the lounge was necessary. I'd be mortified if someone did that next to me. not because I am hugely squeamish (becoming a dad knocked any last vestiges of that out of me) but because it's just appalling bad manners.