The subordinate's frequent gift-giving and flattery of the boss is contemptible.
Tips
usage
献殷勤 carries a mildly negative or ironic tone — it implies that the attention being paid is self-serving or excessive. The proverb 无事献殷勤,非奸即盗 (if someone is unaccountably attentive, they must have an ulterior motive) reflects this suspicion.