I asked him why and he told me that it was very simple: Singapore's sidewalks are very clean with neat red bricks; Taipei's are patched up and things are carelessly put on them.
我問他為什麼，他說，很簡單，新加坡的街道乾淨，紅磚很整齊；台北的人行道地磚就修修補補，上面還亂放東西。