Good way for people to remember the difference! Even my wife had this one mixed up for a while, and she's very sensitive to confrontation. So I confronted her and she was angry for a bit but now she says it correctly.

I have a good friend who thinks teetotal means very drunk when it actually means no alcohol consumption whatsoever. I've brought it up to him a couple times and he reacts negatively. I haven't heard him say it since the second time.

I don't want to be a stick in the mud about these things, I just want people to improve their communication so they are respected and taken seriously.

If I see something like a there/their/they're mistake I just stop reading the comment. Probably unfair of me but I just disregard the person's opinion. And before anyone wants to tell me that not everyone speaks English as a first language, it's actually native speakers who make that mistake. People who learned English later in life generally know the difference.