Yes, I am aware of that. Thank you for reminding me, though. I think you're missing the point and seem really defensive about it for some reason. I don't care what you or any other individual does in their rented property. That's between you and your landlord.
However, whilst I'd love myself and other renters to feel like their rented accommodation was their home, it isn't the case. It can feel like your home and be comfortable but at the end of the day, someone else owns it and in most cases in 2 months can take it back from you (depending where you live, tenancy terms etc)
You've clearly had nice, approachable landlords. Majority (especially in London and other big cities) won't negotiate on these things as they can easily just drop you for another tenant who won't ask these things.
I don't know how you're interpreting any of these posts as 'snobby' - nobody is saying renting is taboo, it's the norm for most young people who move away from their childhood homes.
To bring it back to topic, the issue for me is that he is promoting it as something which is normal and part of the aspirational lifestyle he creates. When most people don't have the time, circumstances or buckets of gifted paint to do it.