The phrase "big deal" is often used to express that something is important, significant, or notable. It can also be used sarcastically to express that something is not important or impressive. Full definition
Finding rich men is not big deal if you search really hard and you also need to follow a few points without which finding a rich man would be a tedious job. (richpeopledatingsites.com)
Don't hesitate to click into their profiles for more information — it's not as big a deal for them to see you looked at their profile as you may think. (blog.gojobhero.com)
No one should be surprised by this decline and no one should make too big a deal of it. (3dpolicy.ca)