No, it was because you were deemed a higher security risk than some others. Look at the sticker they put on the back of passport; what is the number (1-6) on it?
Ari, I transited, I had no sticker.
IIRC you only get the sticker on PP and handluggage when going through first sec check before check in.
So if you say that transit is not uncommon for Tel Aviv, out of interest, do you know of the most common transit connections? Is it Lebanon?