On discussion forums where this subject comes up, you often get people complaining about some mother-in-law or other relative who always keeps her shoes on when visiting. The host never asks her to remove her shoes, but still feels frustrated that she keeps them on.
My question to these complainants would be how they think the relative would feel were she to discover that she is being complained about online. She might be quite upset if she knew that her behaviour was causing such annoyance.
Rather than complaining about her online, perhaps it would be better to just be honest and ask this relative to remove her shoes? Can we not learn to be honest and say what we really think and feel?