It means that Irish people are perfectly happy to expel colonial powers from their own nation using violence when necessary, but loudly deny Israel the right to do the same.
What colonial powers are Ireland denying Israel the right to expel?
If it was wrong of Israelis to force Palestinians to move out of Israel when it was formed, it was also wrong for Irish people to force British people to leave when Ireland became independent
What British people did we force to leave? We got our independence from the British state we didn't banish British people from the country. Not sure if you've ever been here but there are plenty of Scots, Welsh and English living here, my husband included.
You see a lot of Irish people proudly wearing symbols of terrorism like a keffiyeh.
The Keffiyeh is a symbol of terrorism? Since when?
While supporting a theoretical future Palestinian state isn't inherently denying Israel the right to independence, or safety, supporting any of the current Palestinian leadership options
No one is supporting Hamas as a leadership option
That is because even the moderates in the West Bank do not recognise Israel's right to exist as a Jewish state, so advocating for them to lead a fully functional sovereign nation is advocating for them to attack Israel.
So you are not in favour of a two state solution?