Your points are valid but this was harsh and not terribly helpful.
Perhaps harsh my friend but is it harsher than me running you out of my dojo because my wife/husband doesn't like you?
How about because you're Jewish or African American?
The poster doesn't seem to see anything wrong with the idea of ruining
someones Aikido training because of an issue at home.
I see that as selfish spiteful and unprofessional.
How would you feel if the next time you showed up to class your sensei really started cranking it up and making your class so hard that you quit - come to find out later he did it on purpose because he didn't like your skin colour or back round?
I don't think this is a case where kiddy gloves and beating around the bush is the right advice.