If you are a football player in Argentina, you will also get more pressure than if you are a football player in Canada. But i'm sure if you practice curling or ice hockey, that there will be more pressure in Canada than in Argentina. Belgium, together with Italy and France are probably the three biggest cycling nations historically speaking, with Spain and the Netherlands following at a distance. But of those countries, it had been the longest for Belgium to have a GT winner. Yet generations still witnessed Merckx, De Vlaeminck, etc so the anticipation was immense.
Comes along a kid who rides the entire peloton into dust, wins by doing 100k solo rides, by up to 11 minutes, by having the peloton taken out of the race because he lapped them, repeatedly. Some bloke on an internet forum drops the name Merckx and the average Belgian cycling fan gets ecstatic and starts frantically hoping for it to be true. However, many non-Belgians don't exactly like the prospect of a new Merckx-like racer, so lots of people rather ridicule the idea (so many others were heralded as 2nd coming of Merckx and all failed miserably, so why would this one be any different). So the Evenepoel Trials were called into life. A series of neverending trials where the kid has to prove he is the 2nd coming. With every trial he successfully completes, hope warms the hearts of some, fear chills the hearts of others. But either way, tension rises. Add to that, that the kid is outspoken, so plenty to opportunities to berate him and his character.
Unlike Evenepoel, Pogacar was never heralded as an upcoming worldbeater until he actually was a worldbeater. Pog also comes from a cycling nation where there is 0 pressure. To Slovenians, i imagine Pog and Rog are a bit like Clijsters and Henin were in Belgium. In a country with little history in a certain sport, nobody expected anything to happen, so when it did actually happen, it was all good and people were happy for whatever did happen.