No, it usually isn't acceptable for anyone to be vain at all. While looking good and taking pride and confidence in that fact is good for you, being vain is taking it too far; you should have more important things to worry about.
same way that you did
Using a gerund at the beginning of a sentence is perfectly acceptable.
depends :L if you are in a meeting then definitely NO but otherwise its perfectly acceptable as long as you don't overuse it.
Yes, it is perfectly acceptable English.
Yes, it is perfectly acceptable English.
That is perfectly acceptable.
Yes this is perfectly acceptable.
In the UK it's perfectly acceptable.
Craft is a perfectly acceptable word
Yeah... actually not only women are vain. Sometimes it happen men are more vain on how they look rather than a women.
'Welcome' is perfectly acceptable.
Yes this is perfectly acceptable.