If on your way to work
You were stopped by Irish soldiers
Would you lie down do nothing
Would you give in, or go berserk"
The violence didn't exactly start in the '60s. "Conflict has existed, on different scales and with differing intensities, between Ireland and Britain for more than eight centuries.... In the 1600s thousands of English and Scottish settlers were brought to Ireland by British landowners. They displaced Irish Catholics which led to violent conflict."
All this is to say that in international communications (And let's face it: all of it is international communications.) we need to be aware of customs and history. It's impossible not to offend someone with just about anything we write and say. But certainly posting a British pride message on an Irish social site is -- well, it's just plain unAmerican.