I don't think I'd say it is an AGGRESSIVE act, but it IS a suspicious act.
I actively watch for people following me (ex-cop habits). If I think I see someone following me, I will make two 90 degree turns and see if they're still behind me. If so, I assume it is deliberate. I will then either take evasive action or else pick my ground and turn to confront them.
Old military adage: Once is happenstance, twice may be coincedence, but three times is enemy action. If they follow me through two turns headed back the way we came, it is almost certainly deliberate.
It may not be hostile; they may want to hand me a religious tract, or ask me if I'd like to subscribe for 12 issues of Useless Magazine, or ask me if I'd like to buy health insurance.... but if I can't avoid them I'm going to find out before they come up behind me.
Interestingly enough, I once had an incident where I was in a very similar position to Treyvon Martin. I was even wearing a hoodie. (It was cold and windy).
It was daytime. I was walking back from my sister's house down the road, passing a closed garage building with a parking area in front. I veered into the parking lot a bit as I passed, since there is no sidewalk or curb and I didn't want to be any closer to the passing cars than necessary.
THAT was apparently enough to qualify as suspicious in the minds of two young men who'd appointed themselves to guard their Uncle's garage, which had been burgled twice in two weeks. One of them stepped out to block my way, while another tried to circle behind me. I saw #2 and placed myself where I could see both men at once. When #2 saw me do this, he stopped and looked at #1.
What they didn't know: I had a small pistol in the pocket of my hoodie and was pointing at them from inside the pocket.
#1 started barking questions at me: who was I, what was I doing, etc. I barked back that I was walking down the damn road and it was none of his business. THEN I recognized him as a local, and pushed back my hood so he could see me and recognize me as well, which he did. He explained what they were doing. I told them it was a bad idea, confronting strangers on flimsy suspicions, and went on my way.
Somebody just about got shot. Could have been me, of course... I don't know what THEY had in THEIR pockets either.
It could have turned out as a tragic case of misunderstanding ending with one or more dead bodies; I was not pleased to have my way blocked or see someone trying to get behind me, not one bit.
Following someone is not ILLEGAL, that I know of.... but it IS a suspicious and dangerous thing to do.
Fiddling While Rome Burns
Carthago Delenda Est
"I used to roll the dice; see the fear in my enemies' eyes... listen as the crowd would sing, 'now the old king is dead, Long Live the King.'.."
Only an idiot would assume that the person following them means them no harm and, based on that assumption, refrain from further investigation.
Not being an idiot =/= being afraid.
Tucker Case - Tard magnet.
Tucker Case - Tard magnet.
I haven't mentioned legality, and the OP poll doesn't either. There are many improper, bad, unethical things people do, that are not illegal, as I'm sure you know. We're talking risks to ones safety. If some perceives someone else is putting them at risk, they may perceive that as aggressive behavior.. So what they perceive has no bearing other than it is not illegal to be followed unless it is repeated behavior.