Of all the places to judge people for taking an escalator, you pick an airport? Where you have people with heavy luggage, people traveling in groups of mixed mobility, people who spent the entirety of the preceding days walking around looking at sights, people who didn't sleep well on an unfamiliar hotel bed?
Or given a non-airport station, I've found myself standing on the escalator during my morning commute ever since I ramped up my exercise routine. So when you see me, I'm standing because I hit a PR on my squats earlier that morning, or because I finished a 14k run less than an hour ago.