I think you need to distinguish more between what is bullying, and what are just people with different tastes or opinions. Bullying is a terrible thing, and I agree with all those above who suggest using the resources of sites like
bullyonline. Differences of opinion can be frustrating, and make you mad, but that isn't in and of itself bullying.
To start with, the list you give doesn't
actually establish that the groups of people you mention exist, or that the bullying you describe is going on; your first post makes it sound like there are people going out if their way to pick on Tintin and BD fans, but from the list you make, isn't it more true to say that you have constructed these groups hypothetically?
An imaginary list is potentially endless: you could just have easily added "people who don't like reporters", or "people who don't like plus-fours", couldn't you? But just because I can write those things doesn't meant that such groups will exist, does it?
To begin thinking along the lines of "people who like picking on minorities, such as Tintin fans" to me isn't constructive, as it creates a mood of fear, making people worry when there isn't any need to. Using fear to make people unhappy is in itself a form of bullying, so it becomes a circular line of thought, and should be avoided.
Anti-Belgian or anti-French groups
may exist, but that could exist at many levels of degree and intention. Some may be out and out racists, but for example there have been those who have in the past opposed the French use of above-ground nuclear testing in the Pacific, who protested politically; but I have no evidence that either ever picked on someone who was reading Tintin.
You may not like
Tintin in the New World, but it is wrong to accuse M. Tutin of bullying; that is merely a difference in taste.
Inkpot's story that you quote may be bullying, may be an example of someone over-reacting, it is hard to tell; but Khodadad's doesn't look like bullying to me - it just looks like someone who met people with a different opinion or outlook.
It might also pay to remember that in the great scheme of things, Tintin
is just "stuff"; there are people every day, in all parts of the world, being bullied and denigrated for all sorts of reasons over which they have no control, ruining their lives, and that is tragic. To suggest that because someone (hypothetically) makes fun of Tintin on T.V., that that equates to "bullying", is trivializing the plight of many, many people, young and old.