This data can be misleading. Girls probably get way more messasges and guys send more messages. The reply rate for messages sent by a man is probably much lower

This data can be misleading. Girls probably get way more messasges and guys send more messages. The reply rate for messages sent by a man is probably much lower than for messages sent by a woman. A man in more likely to call a woman "pretty" than the other way around. Thus the reply rate for "You're pretty" is low (30%, the average rate is 32%). But the reply rate for man-to-woman messages is 27%. So saying "you're pretty" probably helps.