Sorry, but I not only don't believe you, but I have little to no sympathy for your complaint.
I decided to finally take my provisionals and get into ranked play and during my 10 games I saw quite a few people who would probably claim "I was just offering advice" and they were condescending and rude with their comments. Saying "Hey you need to do this." may seem harmless, but if you put any heat into the comment it will be taken negatively.
I especially remember this in a game where we had someone go off-meta for the midlane. They were very good, but our bot lane was getting wrecked and rather than helping out the midlaner started offering unsolicited advice that was never presented in a kindly fashion. It was all "Hey stupid build attack speed." or "Why did you stick around after the teamfight, noob?" And they never stopped with the comments even as they ran from several fights leaving their teammates to die.
the funny thing was I wouldn't have reported them had they not made a comment in the post game chat that hinted that the account was a smurfed account. That generated an immediate report for verbal abuse from me. I don't mind someone being angry or frustrated, but someone who came into a Silver provisional and claiming to be better is not getting a pass from me. They were part of the same losing team I was, and can take the lumps and ask what they could have done better, not blame the rest of the team for the loss.