"it's just an extraneous sound with no business being there"

Aha - well might I venture a contrary argument?

Marge, you can't have failed to notice that the way the English language is spelled is chock-a-block with extraneous sounds that have 'no business being there', (not to mention extraneous letters that are equally bereaved).

The reason, as you know well, is that written english is a random ossification of the many spoken versions, which evolved over the past thousand years or so. Spelling is based on all manner of temporal and regional variants, many of which display only tenuous connection with 'RP' (and may never have done so - being an attempt at rendering quite a different set of sounds) and even less with other accents and dialects.

The 'r' sound referred to in the OP is one such variant. It's not represented in the spelling and not perhaps a very common one, but it's a valid pronunciation none-the-less.

It's not really fair to call it bad English or ugly. It's just the way some people talk.

Tom