I believe you have winter weather similar to ours. Applying Vaseline would be almost a daily job. When the winds are -40 below there's no stopping frostbite. Roosters don't tuck their heads under their wing at night like hens do. I personally am not chasing roosters around to put Vaseline on them. They get frostbite, parts blocked and fall off and the next season it's not a problem.
As far as your rooster, if he makes you nervous be rid of him as they will feed off of fear. There's a forwardness that is dominating and than there's curiosity. One way to check is to walk at him, he should always move out of the way and give you a minimum of 5 feet of respectful distance. At their age it probably is bold curiosity. Do certain things now can cause more or less aggression. So keep walking through them in a confident manner, and never give them your back. They should always move away from you not towards unless they are coming for food.