Because in the old custom, the woman's closest parents don't come to the door, only her peers and 1 and 2' s elders (uncles and the like) come, so there is no need to entertain them deliberately.
When the man came to pick up the bride, there was no big rule, so he set off firecrackers in front of the door, and the groom gave the mother-in-law luggage. Have a meal and propose a toast at each table. The main purpose of the male company is to stop drinking, and no one will be your guest.
Moreover, the woman's parents will not be in a good mood. After all, women are far from marriage and are reluctant to part with it.
It's hard to say there is such a thing as hostility. Unless both families have acne, they generally don't show their faces to others. So it has nothing to do with the customs of Chongming. Please be careful.