Not too sure about 'indifferent' - just amused. He did show a certain growl to, as you call her, '...that ugly scottish quasi mong singer', but - so saith the Daily Record, made a U Turn, and 'made up' to Susan Boyle.
http://www.dailyrecord.co.uk/entertainment/music/music-news/lou-reed-pays-tribute-to-susan-1074852
Of course, that wasn't all - people on here, after he died, didn't know how to act - the lady immediately below me really went bang at it, with - well...at least one (and the best known) title of one of his tunes along with drippings of envy before - yep, you guessed it...which eventually amassed her the ten points, a youtube tune - actually, two were originally offered...but I guess she thought she was really over-egging the 'I know the words and the tunes but will dive on the oh sheesh wasn't he bad' bandwagon...whereas the answer below is the exact opposite...
https://answersrip.com/question/index?qid=20131027134416AAaDr8T
I think most of us on here have dipped in and out of media buckets - but tend to forget, between around 1964 and 1979 that's what (white) pop stars wanted to be like. Now we get people coming on here sneering and snarling at someone who I suspect half had hardly heard of - and if so, it would have been only been that one tune. He lived his life as he wanted to - and that maybe why many are so envious. Could understand your anger if he'd committed a crime...but then again - this is the UK, you don't have to. Just enjoy yourself - you'll be offending at least half the land!