Is it rude to separate couples at a dinner gathering?

My boyfriends sister in law invited us over for dinner and as soon as we got in she told us that everyone is going to be seated separately from their partner and at separate tables…. my boyfriend didn’t like this and neither do I…. wasn’t this rude of her or what?

my bfs parents have never put us separate ever

It’s rude
Other - pls explain
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Is it rude to separate couples at a dinner gathering?
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