Re: Drawing room?
Unless you are conversing with very rich people who actually have these massive houses with many rooms, I don't think you need to worry about it too much. I certainly don't know anyone who has a drawing room. I associate the word with old mansions which, these days, I go to visit as a tourist because they belong to the National Trust.
In the UK, the room with the TV, sofa etc is the sitting room, living room or lounge. A lot of the usage is regional, not classist.
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