Are Gallipoli jokes taboo ?

Wondering if taking the piss about Gallipoli is off limits ? Was with an extended group of mates last night, I as a British person living here for 20 years thought I'd figured the Aussie sense of humour out, my friend group is pretty relaxed, we have a very dark sense of humour and jokes or one liners about many sensitive topics are shared.a d laughed about

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Last night out conversation turned to the upcoming Australia v Turkey football game at the World Cup, as an off the cuff comment I said something along the lines of "The last time 11 Australians faced so many shots at their defences was at Gallipoli and when Australia loses you're not getting a day off work for this one" . . Was met with jaw drops and a few people saying "you can't say that mate" now this coming from people who regularly jokes about everything from 9/11 to Child abduction/ murder .

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It seems I have found the limit of Australian humour.