I can tell the difference between a normal (128, 192) MP3 and FLAC.
I doubt that. Transparency starts around 192, just by lumping 128 and 192 together suggests to me that you think they are audibly the same. The reality is that 128 and 192 are more dissimilar than 192 and flac. And then once you get to ~250 to 320 it's extremely difficult to tell mp3 apart from lossless in blind tests. You can find a program, I think it's called abx, online and it will allow you to blind test yourself. Now that this is the real way to see when mp3 becomes transparent to you. I treat all blanket assertions that mp3 sounds audibly inferior to flac as suspec. It really is just a matter of when (and not if) mp3 becomes transparent to your ears.