I'm staunchly pro-Palestinian, despise Tommy Robinson and still think this is not a good thing. The UK has been draconian with its anti-free speech and surveillance. Even if you hate what this guy stands for (I do), it's only a matter of time before these techniques are used against causes you do stand for.
Somehow I don't think Tommy Robinson would take such an approach to say the classification of Palestine Action as a "terrorist" organization by the UK government though.
https://en.wikipedia.org/wiki/Palestine_Action#Proscription_...
Surely it's not necessarily what he stands for but the violent way he does it?
Palestine Action acted as terrorists, attacking national defence infrastructure, attacking police with hammers, and called for genocide of Israelis.
You can protest in support of Palestinians without being violent, and without supporting specific proscribed groups; the state asserting it's monopoly on violence is normal. With democracy and rule of law - both strong in the UK - that's not something that will bother protestors.