sorry to say but this cannot be an excuse because drawing on the road is never our habit and as guests in our country, they shall respect our way of life instead of we adapting to their lifestyle.
for example, if u go to india and your indian friends invite you for dinner, you have to use hands to eat as mark of respect.
similar, when foreigners are in Singapore, they have to follow our lifestyle, we dont draw anything on the streets.
ok? no offence ok. u can do it in US / EUROPE does not mean u can do it in sinkie land.
chewing gum is another example ok.