I believe these guys did this to you because one of these two reasons.
1. You were starring at them and maybe saying stuff to your g/f about them.
2. You were wearing all blue (gang colors) and the starring made them wonder.
I don’t think these guys would just choose you to fuck with out of all these people. The "hey Blue" is a good indication of this. If they just wanted to start something they would have started hollering at your women to piss you off. 99.9% of the time this is how they start fights.
And I believe AAP is dead wrong, I don’t care if he is 6"5 350 pounds. 5 of these thugs would have fucked with him probably just because he is big. And if they had a gun, he would be dead. You did the right thing man. Just leave it alone, especially if you don’t know how to scrap. 5 on 1 is a lose lose situation. I couldn’t see any one man defeating 5 guys at once, especially this type of guys who think they have something to prove.
I had 3 (black thugs type) guys do the same thing to me…and I just kept walking, And my stupid girl friend said HEY, I THINK THEY ARE TALKING TO YOU(thinking they were my friends) so I thought I had to prove my shit to my girlfriend, so I turned around and was approaching these guys ready to throw down. And one of them moved his un-button shirt out of the way reveling a gun….I turned around and walked away and had to listen to them laughing at me.