And what do you want to accomplish with the “ignoring?” Giving him the cold should is not going to “resolve” the issue. The silent treatment might make him back off a bit temporarily…and then he might bring up the topic again in the near future. And you’ll be back to square one.
I don’t do hijab, but I don’t think that wearing it makes one paindu or backward or less modern. At the same time, I feel that religious practices should be done with sincerity. When practices are imposed, it can lead to resentment. Your husband needs to understand this, faith needs to be sincere. Would it make him happy to know that you’re following a practice begrudgingly? Is there reward in that? It’s not only our actions, but our faith and intentions behind our actions which are ALSO looked at.
If he wanted a hijabi girl, then he should have married one. People sometimes think that “Oh my partner will change/compromise/come around after marriage.” That doesn’t always happen and not necessarily with ever issue or request. You need to talk to him calmly about this issue, Nadz. If you ignore him/use emotional blackmail to get him to give into you, that’s a just a temporary quick-fix. It won’t last.
Figure out why you don’t want to hijab, maybe you need to analyze yourself. Research the Islamic stance on the issue to get some understanding about it. And then discuss the issue with him. Calmly.