HI Source, Well, I don't see you as sinful at all. 'These ones' seems like acceptable everyday usage, acceptable grammar and acceptable meaning to me. Perhaps whoever told you this is thinking that you can't have 'two ones' as some sort of mathematical offence.
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Anonymous Just makes the person sound uneducatedOr British. It's apparently common in Britain and considered completely grammatical and proper. Use the search box above. Enter these ones and you'll be directed to many more discussions of the subject, if you're interested.
AnonymousIt is enough (and quite complete) to simply say "these".It is also enough (and quite complete) to simply say [sic] "this". And I'll bet you feel no need to protest against the expression "this one".