Spogga said ‘put up a flagpole and fly the union flag.’ (emphasis mine). If this is true, it would be the flagpole which would be the problem, rather than the flag. A flagpole is a rather large item to have in your garden, and it would obscure your neighbours’ view. Remember that England is a much smaller country physically than the US, and our properties are generally much smaller. You’d need planning permission to erect any large structure on your property.
However, even then it depends on your neighbours and your local authority. There is one house near here which does have a large flagpole flying the Union Jack - and it’s right next to a Sikh temple. If the neighbours haven’t complained, the council generally won’t intervene.
Sticking a flag on your car, in your window, anywhere it doesn’t cause a nuisance, most definitely is totally legal and is done all the time.
So Spogga is wrong. Also, this comment:
smacks rather sharply of racism.
As for the rest - it really depends which country in Europe you’re talking about. You can’t lump it all in together - you can’t take one ‘oppressive’ law from Germany (banning of the Nazi party), another from France and another from the UK and say that Europe is oppressive. You can’t mix ingredients from different dishes together and then complain that it tastes bad. The Nazi party isn’t banned in Britain, for example. France has some strict laws governing language, but the rest of the continent doesn’t. Portugal has really weird regulations on how you can name your child, but it’s unique in Europe in that respect.
If all the European countries had all these oppressive laws, then you’d have a point, but they don’t.
Same goes in the US, when it’s to do with criminal cases or national security.
Only in Germany and a couple of neighbouring countries, for good historical reasons.
Really? picks up phone to grass up neighbours and that stupid woman at the school Yay oppressive laws! 
I’m not sure about the rest of Europe, but in the UK it isn’t illegal as such. It could lead to an employee losing their job (but that’s company rules, not national law), and if it accompanies physical violence then the charge would change from GBH (grevious bodily harm) to racially-aggravated GBH. But the actual words themselves aren’t illegal. If they were, it would be illegal to watch MTV!