The attitude of the poet or speaker towards Aunt Jennifer can be described as full of appreciation and sympathy. This can be inferred from several aspects of the poem "Aunt Jennifer's Tigers" by Adrienne Rich.

1. Appreciation for Aunt Jennifer's artistic expression:
The poet acknowledges Aunt Jennifer's creative spirit and her ability to express herself through her needlework. Aunt Jennifer's tapestry of tigers is described as "prancing," "bright," and "fluttering," indicating the poet's admiration for her skill and talent.

2. Sympathy for Aunt Jennifer's oppressive marriage:
The poem also highlights Aunt Jennifer's oppressive marriage and the restrictions she faces as a result. The imagery of the "massive weight" of Uncle's wedding band suggests that Aunt Jennifer feels trapped and burdened by her marital obligations. The repeated references to the tigers' "fearful symmetry" can be interpreted as a reflection of Aunt Jennifer's own fear and lack of freedom.

3. Empathy for Aunt Jennifer's desire for freedom:
The poet sympathizes with Aunt Jennifer's desire for independence and autonomy. The tigers in the tapestry are depicted as strong and fearless, in contrast to Aunt Jennifer's own timid and submissive nature. This juxtaposition suggests that the poet understands and supports Aunt Jennifer's longing for liberation from her oppressive circumstances.

4. Recognition of Aunt Jennifer's legacy:
The final stanza of the poem suggests that while Aunt Jennifer may be physically constrained in her marriage, her artistic creations will endure and leave a lasting impact. The phrase "uncle's wedding band / sits heavily upon Aunt Jennifer's hand" implies that her art will outlive her marriage and serve as a testament to her creativity and resilience.

Overall, the poet's attitude towards Aunt Jennifer is one of appreciation and sympathy, recognizing her artistic talent and empathizing with her desire for freedom and self-expression.