Unless that is you make an amusing video of a dog trained to make a hitler salute when certain nazi phrases are spoken in which case you are arrested, prosecuted and fined. http://www.bbc.co.uk/news/uk-scotland-glasgow-west-43478925
I wish the law was that incitment to violence was a crime but other things aer not but that is NOT the law. Hate speech is an offence and that is disturbing.
Phrases included in that video included "Gas the Jews", followed by giggling. He then shared the video to youtube where it had over 3 million views in order to drive traffic to his other (equally shite) videos. He was supported in court by EDL's Tommy Robinson. He claims it "accidentally leaked" (on to his public youtube profile? pull the other one, its got bells on it) and didn't realise it had that many views.
We don't have free speech in the UK, and never have had. If you want to live in that sort of world, America is across the pond, enjoy.