Not sure there's any issue here really is there? bloke posts a video asking what he did wrong, you all told him (hesitation), so lesson learnt
I do think a lot of experienced motorcyclists forget what a steep learning curve there is for new riders and don't give us new riders enough of a break sometimes. Speaking from my own experience, I'm finding filtering the hardest thing to learn how to do on two wheels. Luckily (or unluckily depending on your point of view), I live in London so at least get to practice it a hell of a lot!
But my experience of filtering past other road users is that car drivers, as a breed, tend to be fairly passive and accepting of it. Yes, every now and then you get an idiot in a Merc, BMW or Audi (I usually don't like to stereotype, but yes, it is ALWAYS one of these kinds of cars) suddenly act like they're in a race with you... but on the whole, that's pretty rare.
The road users that make filtering hell for me are....... *drum roll*......... motorcyclists
In my experience, woe betide you if you're filtering through traffic and another motorcyclist comes up behind you and thinks you could be filtering a bit quicker. The number of times I've had another motorcycle riding as aggressively as they can (practically wheel to wheel sometimes) to make the point that I should speed up is shocking. Now I'm sure that sounds like I must be the slowest bloke on the road, but I swear I come up behind motorcycles filtering more cautiously and slower than I am all the time. When I do, I accept it, give them plenty of space and only overtake them when I think I can do so without startling them.
These days, if I'm filtering and another motorcycle comes up behind me acting like a tool, I just pull out of their way as soon as I can... it's just not worth the hassle. It's dangerous enough filtering past traffic and keeping your wits about you for a car driver suddenly changing direction without having to second guess an arsehole on a bike too.
But anyway, my point is this... we are all on a learning curve. If you're filtering and get held up a little bit by another motorcycle, do try to think that he/she may be a new rider and remember what you were like at filtering when you were new to it. If you try to intimidate them, you could harry them into doing something dangerous or thinking that's the way riding a bike has to be.
To bring all this back on topic... I think experienced riders should give us new riders a break sometimes. What is obvious and 2nd nature to you may be completely new to us. Give the benefit of your experience because that's what we new riders need, but keep in mind that we're still learning and trying our best!!