The number of times I've openly jabbed in restaurants with strangers everywhere except sitting on my seat, all over a lot of the world on occasions, over the last let's say 30 years, as to begin with we didn't have pens cos they weren't invented yet - and no-one has noticed or if they have, haven't commented, I wouldn't have the slightest idea cos it's A Lot.
I only recall ONE occasion where I thought someone was going to kick off - stopped at a seaside resort on the way back to Calais to get the ferry returning home from holidays once, and grabbed chips from the van on t' front, sat on the low wall along the edge of the prom to eat them, Pete holding both trays whilst I jabbed. As I looked up and removed the needle cover (the thin one, the final 'sharps guard' cos its 100 normal to remove them with your teeth of course) from between my teeth cos I stick it back on before unscrewing a needle and chucking that in the sharps bin) and noticed a young couple facing me about 4 yards away across the other side of the Prom, whereupon once they saw me looking at them, he grabbed firmly onto her arm, and marched her promptly away. I said quietly, 'Please go and report me to a gendarme, Oh please, please do that!' We like to spend a lot of time in France hence I can pronounce such words as diabete (no S in French) and insulin correctly*. Buggers didn't though.
* dee-a- bett, an-soo-lan