Being an immigrant who still (and probably will forever) spak with a strong accent, improper pronuncuations do not bother me.
However, there is no excuse for improper word usage.
Such as:
'exetera' when you mean 'et cetera'
'youse' (plural) when you mean 'you'
Or incorrect grammar, in an attempt to appear sophisticated, such as, for example:
"My Dad bought gifts for my wife and !". Why not say: "My Dad bought gifts for I and my wife!" Because it would sound just as stupid.
More to come. Stay tuned.