I can't get upset about the use of condiments before eating. Some people just like more salt or pepper etc on the food, and they are the ones who are going to eat it. I find it arrogant and pretentious when a restaurant doesn't put condiments on the table, presumably on the basis that their food is already perfectly seasoned, and it would put me off going there again. I will say thank you to serving staff and I think you can judge someone by how generous they are in tipping. A lot of hospitality staff are minimum wage and rely on tips - even if furloughed, their earnings will have been slashed.
Still with food, I think it is polite to wait, but also polite for the host to ask the guests to start if the food is likely to go cold. However, I hate 'plated up' food, as I like to decide what items and how much I want to eat.
In terms of texting, I think a reply same day or next day is fine, unless it is something urgent.
I see that a few posters are still hung up about the use of the word 'Pardon'. Relax, Tatler now says it's ok! 
The thing that really winds me up is people who have long and loud conversations on their mobile 'phones on public transport, especially business related conversations. Not only is it extremely discourteous and annoying to those sitting nearby, but it is an appalling breach of client confidentiality.