They are all just as easy to shoot down, if you're willing to spend half a million dollars doing it. When you're Romania that hasn't been fighting a war for years and you get one a day, it's trivial to shoot them down. When you get tens to hundreds a day and you're Ukraine, it's harder since you cannot afford to use F16s and sidewinders to shoot them down. And even if you do, you cannot shoot down all of them, but when you just get one a day, it'll be a while until the 95% interception rate gives you a miss.

Oh, wait, Romania actually got hit by one. https://www.bbc.co.uk/news/articles/c93x4nxlkjeo

It's just a matter of numbers, both percentages and money.